One of Wilhelm's highest ranking men and partner in their section of the Lindwurm Mercenary Brigade, Mueller is the dutiful, stoic type who works full-time to keep the unit in check because Wilhelm is more interested in the ladies.

Mueller is very strict with his unit, and doesn't hesitate to discipline them with an iron rod he carries around.

Mueller was the one who killed Richard's abusive father, and the boy has followed him around ever since. Mueller treats Richard with the same discipline he shows the others, and when Richard goes into fawning over Mueller, he is smacked with the rod same as everyone else.

Initially, Mueller is hired by Salum Barows, but after the Prince's strategy reveals the Armes invaders, Mueller believes that, since it wasn't what he signed up for, he has no contractual obligation. He leaves Salum after he is disgraced, and goes to Raftfleet. The Prince meets him and asks to hire him there. Mueller sees no logical reason to refuse his offer, and does not ask for financial compensation. However, the Prince has to win, because getting such a reputation for winning in Falena's war would mean more lucrative contracts in the future. - Matt620 (article), Basel (image)